[gadders]

Really? Citation please.

[lmm]

http://www.esa.int/Our_Activities/Human_Spaceflight/Astronau...

[wnevets]

>but warm air does not rise in space so astronauts in badly-ventilated sections end up surrounded by a bubble of their own exhaled carbon dioxide.

Whoa, I didn't think about that.

[gadders]

Cool, thanks for that!